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PHP : Function Reference : DOM XML Functions : DomNode->insert_before

DomNode->insert_before

Inserts new node as child ()
domelement DomNode->insert_before ( domelement newnode, domelement refnode )

Example 568. Adding a child

<?php
include("example.inc");

if (!
$dom = domxml_open_mem($xmlstr)) {
 echo
"Error while parsing the document\n";
 exit;
}

$elements = $dom->get_elements_by_tagname("informaltable");
print_r($elements);
$element = $elements[0];

$newnode = $element->insert_before($element, $element);
$children = $newnode->children();
$attr = $children[1]->set_attribute("align", "left");

echo
"<pre>";
$xmlfile = $dom->dump_mem();
echo
htmlentities($xmlfile);
echo
"</pre>";
?>
Examples ( Source code ) » DomNode->insert_before

<?
sample
.xml
<root>
 <
parent>
   <
child><name>Bob</name></child>
   <
child><name>Sue</name></child>
 </
parent>
</
root>
$dom = new DomDocument();
$dom->load("sample.xml");
$parent_path "/root";
$query "//child[position() = 2]";
$query2 "//child[position() = 1]";
$xpath = new DomXPath($dom);
$parent $xpath->query($parent_path);
$under $xpath->query($query);
$above $xpath->query($query2);
$parent->item(0)->insertBefore($under->item(0), $above->item(0));
$dom->save("sample.xml");
Should produce:
<
root>
 <
parent>
   <
child><name>Sue</name></child>
   <
child><name>Bob</name></child>
 </
parent>
</
root

?>

Code Examples / Notes » domnode_insert_before

captainbajoo

In a numbered ordering of the document's nodes, insertBefore() will place newNode at the index held by refNode, and increment refNode's index and all subsequent nodes' indices. This is instead of maintaining refNode's index, placing newNode at refNode's position minus one, and shifting all previous nodes' indices down by one.
The base case of refNode.index = 0 demonstrates why this must be the case, but it is good to know this explicitly, as it affects methods that deal with iteration such as getElementsByTagName().


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